Sash pulley



-Oct. 30, 1923.

R. H. BOWEN SASH PULLEY Filed March 10 1922 FIG: I.

TIG'ZHI INVENTOR: Busse'll 11'. Bowen,

ATTORNEYS WITNESSES:

Patented Get. 30, 1923.

res

RUSSELL H. BOWEN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, TO THE AMERI- CAN PULLEY COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A COBPORATIQN OF PENNSYLVANIA.

SASH PULLEY.

Application filed March 10, 1922. Serial no. 542,621.

To all whom it may concern:

Be it known that I, RUSSELL H. BOWEN, a citizen of the United States, residing in the city; of Philadelphia, in the county of Philadelphia and- State of Pennsylvania, have invented certain new and useful Improvements in Sash Pulleys, whereof the following is a specification, reference being had to the accompanying drawings.

This invention relates to sash pulleys of the type which are fabricated from sheetmaterial by stamping, and an object of the invention is to provide improvements in such pulleys, whereby the construction is greatly simplified and the cost of manufacture reduced to a minimum.

Another object of the invention is to provide a sash pulley which consists of a casing formed in two sections, each section having an expanded portion, so that the abutment of one expanded portion against the other, when the sections of the casing are assembled will constitute an axle upon which the pulley'wheel is designed to be mounted for rotation.

Another object of the invention is to provide a sash pulley of the character above stated which embodies apulley wheel formed of two sections, counterparts of each other and so designed that the assembly of the two sections will define a sash cord receiving groove and a hub portion, the latter having a minimum amount of bearing surface so as to reduce friction as much as practicable without sacrificing trueness of running or strength of the parts.

In addition to the foregoing, this invention comprehends improvements in the details of construction and arrangement of the correlated parts to be hereinafter described and particularly pointed out in the claims.

In the accompanying drawings. Fig. I is a view in side elevation of a sash pulley con structed in accordance with my invention. Fig. II is a view in section taken on the line IIII of the preceding figure.

Fig. III is a view in side elevation of a sash pulley constructed inthe same manner as the sash pulley shown in Figs. I and II,

so but showing a slightly different manner of connecting together the parts of the casing; and V Fig.'IV is a view in section taken 0n;the

of the blank are curved to an angular extent of about ninety degrees as indicated at 15. The centre portion ofeach section 12 and 13 is expanded in the direction'of the curved ends 15 to form a cylindrical stud 16, a depression being correspondingly formed on the opposite side. The studs are formed so as to provide a circular flat end surface 17 at right angles to the circumferential or side walls 18 of the studs. Said v side walls 18' of eachstud are expanded, dllI". ing the formation from a point approximately midway between theend of the stud and the inner surface of the blank, forming an annular abutment or shoulder 19. The walls of the stud flare outwardly as at 20 from the abutment 19 to their point of integral connection'with the body of the blank, and said flared portion is preferably curved or ridged outwardly as shown at 20 to make the shoulder more pronounced.

The pulleywheel comprises two sections 21 and 22, counterparts of each other, and

each formed from disk blanks of sheet materi-al. Each blank is perforated centrally and said centre portion expanded forming the web 23 and peripheral flange 24:. At'

the same time, the material around the central perforation is struck in a direction toward the side of the flange 24 to form an annular hubportion 25. It is to be noted that the corner between the hub portion 25 and the web 23 is slightly flattened as shown at 26. The complete pulley wheel is formed by placing the members 21 and 22 with their webportions in contact and after properly centering them relatively they are permanently connected together by-means of rivets passing" through the web portions, by spot-welding them or by any other means found sufiicient for the purpose. 7 r o studs are also in mutual engagement and maybe permanently connected together by means of a rivet, spot-welding or the like.

The pulley wheel 11 is previously mounted on the axle thus formed by the uxtaposition of the two studs 16, the latter extending through the hub of the pulley wheel as showninFig. II. It will be noted from this figure that the length of the hub of the pulley wheel equals the distance between the abutment shoulders 19', hence the hub will abut snugly" against said abutment shoulders and limit axial movement of the pulley wheel, causing the latter to run true at" all times" The fiattened'corners' 26, when the halves of the pulley wheel are assembled provide an annular recess 27 that not only eliminates a certain amount of rubbing surface between the hub and axle at a point where bearing surface is not required to make the wheel run true, but also provides a recess in which lubricant may be retained and fed gradually to the rubbing parts. A finish 'for the front end of the casing may be rovided in the form of anintegral fiangeor ace plate 28 having parallel sides '29 and rounded ends 30 to engage over, respectively, the sides 12 and 13, and rounded ends '15 of the casing. The flange is formed with a lip 31 upon each side portion 29, said lips entering the casing so'that' they may be permanently attached'to the sides 12 and 13 by means of rivets 82, or by spot-welding. When the pulley casing is fitted into a mortise of a window casing, the flange 28 forms a finish around the edge of the mortise. These sash pulleys are frequently driven by force into a mortise opening when the latter is not quite large enough to receive the pulley casing. This may be done by a careless workman who does not exercise suflicient care, or by others intentionally to secure a tight fit. In any event, such treatment tends to collapse the sides of the pulley casing, causing the sides to' engage the pulley wheel, so that the latter does-not I run smoothly This-isavoided in the pres ent invention by reason of the broad surface at theends of the studs 16,- the latter providing mutual support to the sides of the casing and preventing the sides'trom: moving or flexing inward should lateral pressure be applied thereto. The ability of the studs to thus resist-collapse is enhanced by the fact that the circumferential walls of the studs run axially at right angles to the sides otthe pulley casing; any lateral strain applied to the casing wallsbemg-transmit; ted axially along the walls of the studs.

' for This construction, in combination with the bowed ends of the casing, therefore, provides a very rigid casing which will successfullyre'sist strainscoming from any direction tending to collapse or distort the same. To this end, the diameter of the ends of the studs 16'should be generous andproportioned as shown inthe drawing, or a little over one-third of the diameter-ofthepulley wheel. 3

I have illustrated in Figs. HI and IV, a

leash pulley of the samegeneral construction as the one described above with a slight change in the mannera 'of connecting 'together the studs 16 ortheir equivalenti- The same reference characters are used, to designate corresponding parts 1n th1smod1fica- 'tion with the exception of the studs,the stud formed-- on the side 12jofthe casing being "desigrrated"33and the stud of the si'de' lfi'as 34:. The end of the stud 33'is formed with an opening 35 and the end o'ii' the stud 3 t is similarly'formed with an opening 36', but 1 is bent outward in the course of striking out of smaller diameter than the opening'35; The material at the edges ofthe opening 36 the side plate 13, to form an annular'fla'nge 37 which is adapted to enter the opening 35 when the sides of the casingare assembled and the pulley wheel 'is' in place uponthe studs, as shown in Fig. IV. The fiange' BT is then bent around the edgesjof the open-f ing 35, thus providing a lock joint which will securely hold the sides 12and 13' against separation. As in the first form, the ends of the studs 33 and 34, abutting against each "other,'afl'ord mutual support'ag ainst collapse of the sides of the casing, the circumferential walls 'otthe studs,'running axially at right angles to the sidesfof the casing enhances this effect. Other adva-n tageswill occur to those skilledlin the art to which this invention appertains.

Having thus described my inventionyI- claim:

1. In a sash pulley or the like, a casing having opposite sides expanded inwardly to form a pair of opposedly stepped and mutu-' ally contactingsupports, and means connecting the contacting faces of said supports whereby to form a shouldered cyhndric axle for a pulley wheel. 9

2. In a sash pulley or the like, :1. casing having opposite sides expanded inwardly at opposed pomts'to form a pan: of mutually independent and shouldered cylindrical studswith partly enclosed abutting ends,:

and a pulley wheel mounted on said; studs centralised rotation between the shouldered parts of said studs.

p 3. In asash pulley or. th lik a i g; having pp s -sidevwalls expanded inwardly at opposed pointsito form. a? i of independent shouldered studs with partly enclosed abutting ends, said studs mutually ito engaging at the medial line of. the casing to form an axle, and a pulley-wheel mounted for centralized rotation on said studs be tween the shouldered parts thereof.

4. In a sash pulley or the like, a casing having opposite side walls expanded inwardly at opposed points to form a pair of independent cylindrical and shouldered studs with partly enclosed abutting ends, each stud having a flat inner end and said flat ends mutually contacting to form an axle, and a pulley wheel mounted for rotation on said axle between the shouldered parts thereof.

5. In a sash pulley or the like, a casing comprising a pair of plates having their adjacent end edges curved towards each other and in mutual contact to form end walls and to space the medial portions of the plate, said plates having their medial portions expanded inwardly at opposed points to form a pair of independent cylindrical and shouldered studs with partly enclosed abutting ends, the latter mutually contacting to form an axle, and a pulley wheel adapted to be mounted on said axle for rotation between the shouldered parts thereof.

6. In a sash pulley or the like, a casing having opposite sides expanded inwardly at opposed points to form a pair of cylindrical studs with partly enclosed abutting ends, an annular shoulder in each stud, and a pulley wheel having an annularly flanged hub por tion journalled between said studs, whereby said pulley wheel is supported for rotation, and any axial movement thereof is limited by engagement between the flanged hub portion and said shoulders.

7. In a sash pulley or the like, a casing having opposite side walls expanded in wardly at opposed points to form a pair of independent cylindrical studs with partly enclosed abutting ends, said studs being in alignment and mutual contact to formlan axle, annular shoulders formed on each stud, and a pulley wheel having an annularly flanged hub portion receiving said axle, any lateral movement of said pulley wheel being limited by the engagement of the flange-d hub between the aforesaid annular shoulders.

8. In a sash pulley or the like, a casing having opposite sides expanded inwardly at opposed points to form a pair of aligned cylindrical studs havingflat inner ends in mutual contact to form an axle, their side walls running at right angles to the sides of the casing for a portion of their length and then flared outwardly to form a pair of annular shoulders, mean connecting said flat ends of the studs together to hold the sides of the casing against separation, and a pulley wheel having a hollow hub portion receiving the axle, lateral movement of the pulley wheel being limited by engagement between the shoulders and ends of the hub.

' 9. In a sash pulley or the like, a pulley wheel com-prising a pair of counterpart plates of sheet material in mutual contact, having their peripheries spaced apart to form a sashcord receiving groove and having their centre portions perforated and the material around saidedges bent in opposite c directions to form a hub, the point of flexure of said hub portions being slightly'flattened to form an annular space between the plate to receive lubricant.

10. In a sash pulley or the like, a casing having opposite sides expanded inwardly at.

opposed points to form a pairv of studs, an

annular shoulder on each stud, a pulley of sheet material formed in counterpart halves, each half having a perforated centre portion and the material aroundsaid centre portion bent outwardly to form a hub to receive the studs, any lateral movement of the pulley wheel being limited by engagement between the shoulders and the hub portions.

11. In a sash pulley or the like, a casing having opposite sides expanded inwardly at opposed points to form a pair of cylindrical shouldered studs with partly enclosed abutting ends, the latter being in mutual contact to form an axle, one stud having an opening a'flange on the other stud to enter said opening whereby the flange may be curled around the edges of said opening to form a lock joint to hold the sides of the casing against separation, and a pulley wheel mounted on said axle having an annularly flanged hub seating between the shouldered parts of the aforesaid axle and providing a central recess therewith for lubricant. v

12. In a sashpulley or the like, a casing having opposite walls expanded inwardly to form a pair of studs, each ha-vinga circular side wall which runs axially at right angles to thewalls of the casing, said studs .con-

tacting mutually at their inner ends to form an axle, one stud having its end wall perforated, the other stud having a perforation and the material around said perforation bent outwardly to form an annular flange to enter the first perforation, said flange being subsequently curled around the edges of said first perforation to lock the walls of i the casing against separation, and a pulley wheel having a hollow hub receiving said axle.

13. In a sash pulley or the like, a casing comprising a pair of wall plates each having a medial portion expanded. to form a cylindrical stud, the side walls of which are flared outwardly at their point of flexure with the plates to form a shoulder, said studs having their ends in contact to form an axle, one stud having its end wall perforated, a flange formed" on the other stud to enter the perforation and subsequently turned overt-0 lock' the plates tQgethen-a signed my name at- Philadelphia, Pennsyl- 5 pulley Wheel, Q'Hdia hOllOW hub-formecPwith 'vania; this 23rd day of February, 1922. said pulley Wheel'to' receive "the axle, said hub being of a length w fill the space be- RUSSELL BOWEN- G tween said shoulders Whereby'th'e pulley Vvitriessesz V wheel is caused to run true; JAMES H. BELL,

In testimony "whereofl have hereunto E. L. FULLERTON; 

